Study of Dependence of Kinetic Freezeout Temperature on the Production Cross-Section of Particles in Various Centrality Intervals in Au–Au and Pb–Pb Collisions at High Energies

Ajaz, Muhammad; Peng, Guang-Xiong

doi:10.3390/e23040488

Cited by 8 publications

(4 citation statements)

References 62 publications

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“…5 GeV/c which involves the resonance production that is not described by the model, but one can read ref. [17,18] for more details of very soft and very hard processes. Generally, the soft excitation process is distributed in a narrow p T range of less than 2-3 GeV/c or a little more, and mostly light flavor particles are produced in this region.…”

Section: Formalism and Methodsmentioning

confidence: 99%

Observation of different scenarios in different temperatures in small and large collision systems

Waqas¹,

Liu²,

Peng³

et al. 2021

Preprint

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We used the modified Hagedron function and analyzed the experimental data measured by the BRAHMS, STAR, PHENIX and ALICE Collaborations in Copper-Copper, Gold-Gold, deuteron-Gold, Lead-Lead, proton-Lead and proton-proton collisions, and extracted the related parameters (kinetic freeze-out temperature, transverse flow velocity, kinetic freeze-out volume, mean transverse momentum and initial temperature) from the transverse momentum spectra of the particles (non-strange and strange particles). We observed that all the above parameters decrease from central to peripheral collisions, except transverse flow velocity which remains unchanged from central to peripheral collisions. The kinetic freeze-out temperature depends on the cross-section interaction of the particle such that larger cross-section of the particle corresponds to smaller T0, and reveals the two kinetic freeze-out scenario, while the initial temperature depends on the mass of the particle and it increase with the particle mass. The transverse flow velocity and mean transverse momentum depends on the mass of the particle and the former decrease while the later increase with the particle mass. In addition, the kinetic kinetic freeze-out volume also decrease with particle mass which reveals the volume differential freeze-out scenario and indicates different freeze-out surfaces for different particles. We also extracted the entropy index-parameter n and the parameter N0, and the former remains almost unchanged while the later decrease from central to peripheral collisions. Furthermore, the kinetic freeze-out temperature, transverse flow velocity, kinetic freeze-out volume, initial temperature, mean transverse momentum and the parameter N0 at LHC are larger than that of RHIC, and they show their dependence on the collision cross-section as well as on collision energy at RHIC and LHC.

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Section: Formalism and Methodsmentioning

confidence: 99%

Observation of different scenarios in different temperatures in small and large collision systems

Waqas¹,

Liu²,

Peng³

et al. 2021

Preprint

Self Cite

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“…The parameters are tuned in such way so that the nonstrange hadron spectra remain unchanged [5,6]. In addition, we have also tuned centralitydependent strangeness suppression factor (γ s ) to account for the possible non-equilibrium of strange quark in achieving chemical equilibrium [2,7,42]. These parameters predominantly describe the soft particle production in the model and are tuned to properly describe the production of strange baryons for the present study [7,8,43,44].…”

Section: Physics Framework Of the Hydjet++ Modelmentioning

confidence: 99%

“…In fact, an enhancement in the yield of strange hadrons in A+A collisions appropriately scaled by N coll compared to that in p+p collisions at the same energy serves as an important signal for the formation of QGP medium in A+A collisions [1]. Multi-strange hadrons (especially Ξ and Ω) [2] have small hadronic cross-sections and an early hadronization compared to non-strange hadrons [3][4][5][6][7][8][9], therefore, revealing valuable information about the partonic stage rather than the hadronic stage of the medium evolution.…”

Section: Introductionmentioning

confidence: 99%

p _T-spectra, nuclear modification factors (R _AA, and R _CP) of (multi-) strange hadrons in Au+Au collisions at

Devi,

Singh,

Singh

2024

J. Phys. G: Nucl. Part. Phys.

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In this article, we have reported the transverse momentum ($p_T$) spectra and nuclear modification factors of (multi-) strange hadrons produced in Au+Au collisions at $\sqrt{s_{NN}} =$ 200 GeV using the Monte Carlo HYDJET++ model. For the present study, we have tuned few of the input parameters, in both soft as well as hard parts, of the model to appropriately describe the production of (multi-) strange hadrons. We have presented the $p_T$-spectra of (multi-) strange hadrons in different centrality intervals. On comparing $p_T$-spectra with the experimental data, we observe that the model does not achieve thermal equilibrium for (multi-) strange hadrons in peripheral collisions and at high $p_T$. The $R_{AA}$ results obtained by the model reproduce the experimental data well while the $R_{CP}$ results show a larger suppression at high $p_T$ than the experimental data. Further, HYDJET++ results are also compared with different theoretical models and discussed, wherever possible.

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“…In fact, it is hard to say that which scenario is correct. Furthermore, the freezeout parameters such as kinetic freeze-out temperature (T 0 ), transverse flow velocity (β T ) and kinetic freeze-out volume (V ) also depends on other things such as collision energy [13,15,16], centrality [14,[16][17][18][19][20][21][22][23][24], production cross-section [14,17], multiplicity [25] and rapidity [26]. We wonder whether there is also a role of quarks or nucleons coalescence, and isospin symmetry in the freeze-out of particles or not.…”

Section: Introductionmentioning

confidence: 99%

Particle species and energy dependencies of freeze-out parameters in high-energy proton–proton collisions

et al. 2022

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We used blast wave model with Tsallis statistics to analyze the experimental data measured by ALICE Collaboration in proton-proton collisions at Large Hadron Collider and extracted the related parameters (kinetic freeze-out temperature, transverse flow velocity and kinetic freeze-out volume of emission source) from transverse momentum spectra of the particles. We found that the kinetic freeze-out temperature and kinetic freeze-out volume are mass dependent. The former increase while the latter decrease with the particle mass which is the evidence of a mass as well as volume differential kinetic freeze-out scenario. Furthermore we extracted the mean transverse momentum and initial temperature by an indirect method and observed that they increase with mass of the particles. All the above discussed parameters are observed to increase with energy. Triton (t), hyper-triton ( 3 ΛH ) and helion ( 3 He) and their anti-matter are observed to freeze-out at the same time due to isospin symmetry.

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Study of Dependence of Kinetic Freezeout Temperature on the Production Cross-Section of Particles in Various Centrality Intervals in Au–Au and Pb–Pb Collisions at High Energies

Cited by 8 publications

References 62 publications

Observation of different scenarios in different temperatures in small and large collision systems

Observation of different scenarios in different temperatures in small and large collision systems

p _T-spectra, nuclear modification factors (R _AA, and R _CP) of (multi-) strange hadrons in Au+Au collisions at

Particle species and energy dependencies of freeze-out parameters in high-energy proton–proton collisions

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Study of Dependence of Kinetic Freezeout Temperature on the Production Cross-Section of Particles in Various Centrality Intervals in Au–Au and Pb–Pb Collisions at High Energies

Cited by 8 publications

References 62 publications

Observation of different scenarios in different temperatures in small and large collision systems

Observation of different scenarios in different temperatures in small and large collision systems

p T -spectra, nuclear modification factors (R AA , and R CP ) of (multi-) strange hadrons in Au+Au collisions at

Particle species and energy dependencies of freeze-out parameters in high-energy proton–proton collisions

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p _T-spectra, nuclear modification factors (R _AA, and R _CP) of (multi-) strange hadrons in Au+Au collisions at